move search to not be a chain (#226)

tests/integration_tests/chains/test_self_ask_with_search.py

@@ -1,7 +1,7 @@
 """Integration test for self ask with search."""
 from langchain.agents.self_ask_with_search.base import SelfAskWithSearchChain
-from langchain.chains.serpapi import SerpAPIChain
 from langchain.llms.openai import OpenAI
+from langchain.serpapi import SerpAPIWrapper
 
 
 def test_self_ask_with_search() -> None:
@@ -9,7 +9,7 @@ def test_self_ask_with_search() -> None:
     question = "What is the hometown of the reigning men's U.S. Open champion?"
     chain = SelfAskWithSearchChain(
         llm=OpenAI(temperature=0),
-        search_chain=SerpAPIChain(),
+        search_chain=SerpAPIWrapper(),
         input_key="q",
         output_key="a",
     )

tests/integration_tests/test_serpapi.py

@@ -1,9 +1,9 @@
 """Integration test for SerpAPI."""
-from langchain.chains.serpapi import SerpAPIChain
+from langchain.serpapi import SerpAPIWrapper
 
 
 def test_call() -> None:
     """Test that call gives the correct answer."""
-    chain = SerpAPIChain()
+    chain = SerpAPIWrapper()
     output = chain.run("What was Obama's first name?")
     assert output == "Barack Hussein Obama II"